Foundry flask



R. W. TACCONE FOUNDRY FLASK Sept. 6, 1966 Filed Feb. 2. 1965 INVENTOR. RUSSELL W. TCCONE p/dp// Unted States Patent Office 3,270 Patented Sept. 6, 1966 3,270,380 FOUNDRY FLASK Russell W. Taccone, Eric, Pa., assignor to Taccone Corporation, Eric, Pa., a corporation of Pennsylvania Filed Feb. 2, 1965, Ser. No. 429,785 1 Claim. (Cl. 22-110) This invention relates to foundry flasks and, more particularly, to the type of foundry fiasks generally used for molding green Sand.

In high pressure and high density molding, the pressure of the sand tends to spread and distort -the sides of the flask. Thus, it is often necessary to use cross bars extending across the flask to hold the sides of the flask in place. These cross bars are also helpful in holding the Sand in the fiask and from falling out of the fiask when the flask is transported with a mold formed therein and without a bottom board in contact with the Sand to hold it in the flask.

Further, where diaphragm machines are used to make molds, it is not practical to use bottom boards on the flasks to support the sand therein. Sand retaining strips or ledges are commonly used on the inside of the flask to help hold t-he Sand herein. These ledges and cross bars cause various disadvantages.

The purpose of the present invention is to create a flask which will have sufficient strength to withstand the tremendous pressures created during high pressure or high density molding. The design of the box section enables foundrymen to utilize the fiask without bars. Box section design results in a section modulus which is Stronger in the respects required for mold-ing than any other section commercially available on the market today. It is Stronger than any other cross section for a given weight. This box section design eliminates corners and exposed edges for Sand contamination.

Flasks of this design provide an -unobstructed opening therethrough. Thus, punch outs or punch up equipment may be used because of the elim'ination of bars. Flas-ks of this design also eliminate the necessity of sand retaining strips or ledges inside the fiasks. Instead of Sand retaining str-ips, the inside surface of the fiask is tapered from bot'h top and bottom toward the center. This taper is from two to six degrees in magnitude. As the mold is rammed into the flask, this taper causes the Sand to be locked firmly into the iflask. Because of the elimination of Sand lock devices, the flask can be punched out clean.

This, of course, is highly beneficial because the flask will then be indexed into the molding machine minus the dry Sand which normally adheres to the flask when Sand locks are used. This is a very important point because a flask which is not cleaned properly will deposit dry sand on the pattern plate and, as a result, the casting will end up with dry Sand inclusions on the surface.

As will be noted, the voids or cavities created by the box section can be filled with dry sand or metal shot to add weight to the cope half of the fiask. This feature makes possible, on a wide range of castings, the elimination of weights or clamps.

It is, accordingly, an object of the present invention to provide an improved foundry flask.

Another object of the invention is to provide an improved foundry flask having walls which are made in the form of box Sections.

Still another object of the invention is to provide an improved reinforcing means for a foundry fiask.

A further object of the invention is to provide a foundry flask which is simple in construction, economical to manufacture, and simple and efficient to use.

With the above and other objects in view, the present invention consists of the combination and arrangement of narts 'hereinafter more fully described, illustrated in the accompanyi'ng drawing and more particularly pointed out in the appended cia-im, it being understood that changes may be made in the form, size, proportions, and minor details of construction without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawing:

FIG. l is an isometric view partly in cross section of a flask according to the invention;

FIG. 2 is a cross sectional view taken on line 2-2 of FIG. 1;

FIG. 3 is a cross sectional view of the flask taken on line 3-3 of PIG. 1 showing a cope and drag supported together with sand therein and casting being poured; and

FIG. 4 is a cross sectional view similar to FIG. 2 of another embodiment of the invention.

Now with more specific reference to the drawing, FIGS. l to 3 show a flask 10 made up of a cope 11 and a drag 12. The cope and drag are quite similar. The cope section is shown in FIG. 1.

The cope and drag each have an upper wall 13 and a lower wall 14 which make up the inner wall. The inner wall extends around the entire interior of the flask 10. The lower wall of each side extends upwardly and outwardly and the lower wall 14 extends upwardly and inwardly, thus providing generally a concave portion to receive the sand and prevent it from sliding out after it is packed in place.

The cope 11 and drag 12 each have a top flange 16 and a bottom flange 17 which are integrally attached to inner wall and extend outwardly and are integrally attached to an outer wall 19. An intermediate flange 20 is integrally attached to the inner wall and to the outer wall 19 as shown. An outer rib 21 is integrally attached to the outer wall 19 midway between the top flange 16 and the bottom flange 17. The bottom flange 17 extends out beyond the outer wall 19 and the 'top flange 16 extends outwardly beyond the outer wall as shown. The bottom flange 17 of the drag 12 may rest on the r-ollers of the roller conveyor to convey the tlask.

A suitable locating pin will be provided in the drag 12 extending upwardly therefrom at each side t-hereof. This locating pin will mate with and be received in an opening 24 in the cope 11 to locate the cope on the drag in the conventional manner. A recess 26 in each si'de of the outer wall may be boxed in by suitable plates 27 as shown.

The opening 2'4 is in alignment with an opening 24' in the bottom flange 17. When the flask is assembled as shown in FIG. 3, the bottom flange 17 of the c-ope rests on the top flange of the drag and pin 30 extends through opening 24' and up through opening 24.

The -flask 10 may have a Sand mold formed therein. This mold may be formed on a suitable molding machine such as shown in Patent No. 2,6'98,i9'76 and the molten metal may be poured from a suitable ladle 28 as indicated schematically.

In the embodiment of the invention shown in FIG. 4, the flask has upper and lower fianges and 131 which are integrally attached to a wall 113. The wall is deformed at 114, 115, and 116 so that an inwardly extendling convex or raised portion is formed. These portions prevent the Sand from sliding out.

The foregoing specification sets forth the invention in its preferred practical forms but the structure shown is capable of m-odification within a range of equivalents without departing from the invention which is to be understood is Abroadly novel as is commensurate with the appended claim.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

A fiask made up of a cope and drag each having integral walls extending completely therearound and defining an enclosure open at the top and bottom,

said walls comprising an inner Wall and an outer Wall,

said cope and said drag each having a top fiange integrally attached to the top of said inner Wall and extending outwardly therefrom,

a bottom fiange integrally attached to the lower edge of inner Wall and extending outwardly therefrom, said outer wall of said cope and said outer Wall of said drag each being integrally attached to the outer ends of the respective said fianges thereof whereby said inner Walls, said outer wall and said fianges define a box like section forming said integral walls,

said drag having a locating pin attached to its said upper fiange and extending outwardly therefrom,

a recess forrned in said outer Wall of said cope and plates attached to said inner Wall and exten'ding Out- Wardly and attached to the marginal edges of said recess in said outer wall,

an opening in the lower of said plates and an opening in said bottom flange in Vertical alignment with said opening and said bottom flange,

said cope being attached to rest on said drag With said bottom fiange of said cope resting on said top fiange of said drag and said locating pin extending through said openings.

References Cited by the Examiner UNITED STATES PATENTS 1,855,521 4/1932 Kunert 22-96 2,611,162 9/1952 Ernest et al 22-96 X FOREIGN PATENTS 884,615 12/1961 Great Britain.

J. SPENCER OVERHOLSER, Primary Examner. E. MAR, Assistant Examiner. 

